66140008 has 32 divisors (see below), whose sum is σ = 136618560. Its totient is φ = 29767680.

The previous prime is 66139993. The next prime is 66140027. The reversal of 66140008 is 80004166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5416 + ... + 12712.

It is an arithmetic number, because the mean of its divisors is an integer number (4269330).

Almost surely, 2^66140008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66140008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68309280).

66140008 is an abundant number, since it is smaller than the sum of its proper divisors (70478552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66140008 is a wasteful number, since it uses less digits than its factorization.

66140008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7417 (or 7413 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 66140008 is about 8132.6507363836. The cubic root of 66140008 is about 404.4095608077.

The spelling of 66140008 in words is "sixty-six million, one hundred forty thousand, eight".